A reconstruction of the Temple of Jupiter in Pompeii, which was destroyed by an earthquake.Expedia

To the chagrin of archaeologists, many of the world's oldest structures remain only in ruins.

The team at Expedia was so interested in learning what ancient landmarks looked like thousands of years ago that the travel company commissioned a series of digital reconstructions of sites like the Parthenon in Athens, Greece, and Egypt's Luxor Temple.

With the help of technology, you can step back through the ages and take in the unspoiled wonder of some of the world's most incredible structures. Read on to see what seven ancient iconic buildings look like now versus how they would have appeared in their glory days.

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The Parthenon in Athens, Greece, was constructed in the 5th century BCE.

The Parthenon is characterized by its Doric columns, which have survived through the centuries.Expedia

Standing tall on the hill of the Acropolis, Athens' ancient citadel, the Parthenon, was dedicated to Athena, the Greek goddess of wisdom and war.

The temple — which is constructed from white marble in the Doric style — sustained damage through the centuries, most notably when its center was destroyed in 1687 during the Great Turkish War.

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While it was mostly destroyed, the Parthenon's basic structure has survived.

More of the temple might still be intact if it had been repaired before the eruption of Mount Vesuvius.

Since the temple wasn't repaired before the infamous eruption of Mount Vesuvius— a natural disaster that killed an estimated 13,000 people — this reconstruction gives us significant insight into lost architectural history.

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Hadrian's Wall in England designates a boundary of the Roman Empire. The 73-mile-long structure is lined with milecastles, observation towers, and forts.

Excavations of the temple since the 1960s have revealed sandstone fragments and a life-sized statue of Ramses II's wife, Queen Nefertari.

Thanks to excavations completed in the 1960s and onward, archaeologists have been able to recover thousands of sandstone fragments inscribed with hieroglyphs and images of temple rituals. They also unearthed a life-sized statue of Queen Nefertari, wife of Ramses II.

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Located 30 miles outside Mexico City, Teotihuacán — one of the largest ancient cities in the Americas — was built between the 1st and 7th centuries CE.

Even in its current state, the Pyramid of the Sun is impressive.Expedia

While scientists still haven't determined exactly who built Teotihuacán— the ancient city's name means "the place where the gods were created" in the Aztec language — archaeological evidence indicates that cultures including the Maya, the Mixtec, and the Zapotec have all left their mark on the metropolis.

Teotihuacán's largest monument is the Pyramid of the Sun, which is also one of the biggest structures of its kind in the Western Hemisphere.

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Restored to its former glory, the Pyramid of the Sun is even more astounding.

Rome's Area Sacra di Largo Argentina, a collection of temple ruins, was unearthed by accident during construction at the site in the 1920s.

The temple ruins of Area Sacra di Largo Argentina have been cataloged by letter. Temple B was built last, in 101 BCE. Expedia

The ruins of the Area Sacra di Largo Argentina — which comprises four separate temples that were built in Republican Rome between the 4th and 2nd centuries BCE — were unearthed by accident when workers were completing demolition work in 1926.

The temples have been cataloged by letter (A-D) but are also known by their religious function. For instance, archaeologists refer to Temple B - the newest of the bunch — as Aedes Fortunae Huiusce Diei (Temple of Fortune on This Day) because they discovered the fragments of an idol nearby that has possible ties to the goddess Fortuna.

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All that remains of Temple B are six stone Corinthian columns. If the structure were in pristine condition today, this is what it would look like.

A reconstruction of Temple B in the Area Sacra di Largo Argentina.Expedia

Although the realities of ancient Roman religion might be far removed from our 21st-century lives, the Area Sacra di Largo Argentina gives us insight into what temple worship was like.

And even if you have no interest in architecture, you might be delighted to learn that the site has been inhabited by stray cats since excavation began in the '20s, which prompted the opening of a feline-focused animal sanctuary.

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